c484846c44
function old new delta strings_main 422 420 -2 setfattr_main 175 173 -2 brctl_main 1548 1546 -2 makedevs_main 979 975 -4 rev_main 337 332 -5 getfattr_main 307 302 -5 cut_main 1201 1196 -5 cksum_main 398 393 -5 umount_main 573 565 -8 ln_main 516 508 -8 expand_main 660 652 -8 df_main 1068 1060 -8 renice_main 346 332 -14 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/13 up/down: 0/-76) Total: -76 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
136 lines
3 KiB
C
136 lines
3 KiB
C
/*
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* getfattr - get extended attributes of filesystem objects.
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*
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* Copyright (C) 2023 by LoveSy <lovesykun@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config GETFATTR
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//config: bool "getfattr (12.3 kb)"
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//config: default y
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//config: help
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//config: Get extended attributes on files
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//applet:IF_GETFATTR(APPLET_NOEXEC(getfattr, getfattr, BB_DIR_USR_BIN, BB_SUID_DROP, getfattr))
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//kbuild:lib-$(CONFIG_GETFATTR) += getfattr.o
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#include <stdio.h>
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#include <sys/xattr.h>
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#include "libbb.h"
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//usage:#define getfattr_trivial_usage
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//usage: "[-h] {-d|-n ATTR} FILE...\n"
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//usage:#define getfattr_full_usage "\n\n"
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//usage: "Get extended attributes"
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//usage: "\n"
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//usage: "\n -h Do not follow symlinks"
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//usage: "\n -d Dump all attributes"
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//usage: "\n -n ATTR Get attribute ATTR"
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enum {
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OPT_h = (1 << 0),
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OPT_d = (1 << 1),
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OPT_n = (1 << 2),
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};
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static int print_attr(const char *file, const char *name, char **buf, size_t *bufsize)
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{
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ssize_t len;
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if (*bufsize == 0)
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goto grow;
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again:
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len = ((option_mask32 & OPT_h) ? lgetxattr: getxattr)(file, name, *buf, *bufsize);
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if (len < 0) {
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if (errno != ERANGE)
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return len;
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grow:
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*bufsize = (*bufsize * 2) + 1024;
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*buf = xrealloc(*buf, *bufsize);
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goto again;
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}
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printf("%s=\"%.*s\"\n", name, len, *buf);
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return 0;
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}
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static ssize_t list_attr(const char *file, char **list, size_t *listsize)
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{
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ssize_t len;
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if (*listsize == 0)
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goto grow;
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again:
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len = ((option_mask32 & OPT_h) ? llistxattr : listxattr)(file, *list, *listsize);
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if (len < 0) {
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if (errno != ERANGE)
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return len;
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grow:
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*listsize = (*listsize * 2) + 1024;
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*list = xrealloc(*list, *listsize);
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goto again;
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}
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return len;
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}
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int getfattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int getfattr_main(int argc UNUSED_PARAM, char **argv)
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{
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const char *name;
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exitcode_t status;
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int opt;
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char *buf = NULL;
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size_t bufsize = 0;
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char *list = NULL;
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size_t listsize = 0;
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opt = getopt32(argv, "^"
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"hdn:"
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/* Min one arg; -d and -n are exclusive */
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"\0" "-1:n--d:d--n"
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//getfattr 2.5.1 does not enforce this: ":d:n" /* exactly one of -n or -d is required */
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, &name
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);
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argv += optind;
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status = EXIT_SUCCESS;
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do {
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int r;
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//getfattr 2.5.1 with no -n/-d defaults to -d
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if (!(opt & OPT_n)) {
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ssize_t len = list_attr(*argv, &list, &listsize);
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if (len < 0)
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goto err;
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if (len > 0) {
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char *key;
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printf("# file: %s\n", *argv);
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key = list;
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while (len > 0) {
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ssize_t keylen;
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r = print_attr(*argv, key, &buf, &bufsize);
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if (r)
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goto err;
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keylen = strlen(key) + 1;
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key += keylen;
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len -= keylen;
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}
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bb_putchar('\n');
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}
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} else {
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printf("# file: %s\n", *argv);
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r = print_attr(*argv, name, &buf, &bufsize);
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if (r) {
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err:
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bb_simple_perror_msg(*argv);
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status = EXIT_FAILURE;
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continue;
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}
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bb_putchar('\n');
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}
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} while (*++argv);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(buf);
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fflush_stdout_and_exit(status);
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}
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